30 Questions
What is the difference between pharyngeal clefts and pharyngeal pouches?
Pharyngeal clefts are external grooves and pharyngeal pouches are internal grooves between two arches
Which part of the first pharyngeal arch becomes the future maxilla, zygomatic bone and part of the temporal bone?
Maxillary prominence
What does the ventral part of the first arch cartilage form?
The horseshoe-shaped primordium of the mandible
What does the dorsal end of the second arch cartilage (Reichert cartilage) contribute to?
The stapes, styloid process and stylohyoid ligament
What structure does Meckel's cartilage give rise to?
The malleus and the sphenomandibular ligament
What happens to the middle section of the first arch cartilage?
It regresses, but its perichondrium forms the anterior ligament of the malleus and sphenomandibular ligament
Which structures arise from the paraxial mesoderm during head and neck development?
Skull base, occipital bone, posterior head muscles, and meninges caudal to the prosencephalon
What is the origin of the laryngeal cartilages and connective tissue within the laryngeal region?
Lateral plate mesoderm
Which of the following structures originate from neural crest cells during head and neck development?
Skeletal structures of the face and pharyngeal arches, teeth, sensory neurons, and gland stroma
What is the source of the ectodermal placodes during head and neck development?
Neuroectoderm
Which structures in the head and neck region arise from the migration of neural crest cells?
Skeletal structures of the face and pharyngeal arches, teeth, and sensory neurons
What is the term used to describe the mesenchymal growths that form the pharyngeal arches?
Pharyngeal arches
Which pharyngeal arch cartilage forms the greater cornu of the hyoid bone?
3rd arch cartilage
From which type of cells do the epiglottic and thyroid cartilages appear to develop?
Neural crest cells
Which muscles do myoblasts from the first pharyngeal arch give rise to?
Muscles of mastication
Which muscles do myoblasts from the second pharyngeal arch give rise to?
Muscles of facial expression
Which muscle does myoblasts of the 3rd pharyngeal arch give rise to?
M.stylopharyngeus
What is the main component that makes up pharyngeal arches?
Ectoderm
Which artery does the 3rd pharyngeal arch give rise to?
Common carotid artery
At the end of the 4th week, how many pairs of pharyngeal arches are formed?
4 pairs
What does pharyngeal pouch and pharyngeal cleft completely regress in humans?
Pharyngeal arch 5 and pouch 5
Which structure will the ectoderm in the lateral aspect of pharyngeal arches contribute to?
Skin and connective tissue of head and neck
Which artery does aortic arch 6 become?
Pulmonary arteries
What structures are derived from the first arch?
Stapes and long limb of incus
Which cranial nerve is associated with the second arch?
Facial nerve (CN VII)
What does the third pharyngeal pouch give rise to?
Inferior parathyroid gland
Which artery is derived from the fourth arch?
Aortic arch
What muscles are associated with the sixth arch?
Intrinsic muscles of larynx
Which bone is part of the skeletal structures derived from the first arch?
Mandibule
What nerve is associated with the third arch?
Glossopharyngeal nerve (CN IX)
Learn about the development of the head and neck in embryos, focusing on the formation of pharyngeal arches. Explore the sources that give rise to the head and neck structures like paraxial mesoderm, lateral plate mesoderm, neural crest, and ectodermal placode.
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